Shutter



C. ANDERSON SHUTTER Nov. 7; 1933.

Filed Deo.

III'I IIII.

' INVENTOR Cla/"e Anderson.

ATT'oRNEY Patented Nov. 7, 1933' UNITED 'STATES BHUTTEB A Clare Anderson, Belleville, N. J., signor to Westinghouse Electrica Manufacturing a corporation of Pennsylvania Dany Com-

Application December 27 1 93. swarm. 505,059

7 clams. (ci. azi-19.3) e I My invention relates-to oscillographs and more articularly to an electromagnetic shutter suitable for use in oscillographs.

An t object of my invention is to provide an lin-1 5. proved' shutter for an oscillograp A further object of my invention is to provide shutters which have ating characteristics.

In practicing my invention, I employ a magi projecting from the vanes 29.

be lighted without'exposing the lm. 'I he shutter is' specially constructed for fast, operation and is so located, with respect to to obtain a maximum speed Other objects, features and'advantages of my invention vwill be apparent from the following description, taken irl-connection with the accompanying drawing Vin which: 1

Fig. 1 is a View of portion of the shutter cover plate being broken Fig. 2 is a, View taken on the line 'II-II of Fig. l, Fig. 3 is a sectional view taken on line III-III of Fig. l,

Fig. 4 is a IV-IV ofFig. 1, and

Fig.- 5 is a view, in cross-section, of a nxodined form of shutter. A

A magnetic shutter 18, which constitutes my invention, may be positioned in an oscillograph between the galvanometers and a slit to the photographic lm. A cylindrical lens 34 is mounted opposite the slit 16 and supported by means of the shutter structure.

Referring to Figs. 1 to 4, the shutter 18 comprises a magnetic casing surrounding a magnet coil 23. The casing comprises a piece ofmagnetic sheet material24 (Fig. 3') whic has along recmeans of a rectangular strip 27 of magnetic material and a rectangular strip 28 of non-magnetic improved speed and operthe side of the shutter, a

perspective. view taken on the 'line h 16 adjacent slit 16 in the oscillograph casing. The vanes are respectively pivoted on thelateral edge oistrips 27 and 'I'he cylindrical lens 34 is supported on the back oi' the shutter structure sheet material 35 having'a rectangular opening Fig. 4. The shutter illustrated lullig. 5 is the same in principle as the vand lower edges of the plate 40 are' bent over to form the top and bottom of the casing for the coil 42.- l The front of the coil casing is formed by piece of magneticmaterial bent into the form of a trough. Each vane is pivotally mounted between the plate 40 and the supporting lugs 45. Y A piece of magnetic sheet material 47 is riveted 100 The plate 47 has a rectangular opening 48 punched therein; the plate 47 at the upper and lower edges of the openingbeing turned inwardly 10F thatthe vanes rest against the p ojections -49 when the shutter is open.

The sides 5o of the troughesnape vanes 4s serve 11 both as shutter vanes and as armatures of the magnet for operating the shutter. The other sides 51 of the trough-shape members 46 act sole- I iy as armatures for increasing the speed of the shutter. i

It will be noted that, inv this form of shutter,

there are two magnetic paths,v portion oi' the shutter, the rst path may be traced through the plate 40, the upper armature 51 and the members 44 and 43. The other path may be traced through the plate 40, the lower armature 50, projection 49' and the plate 47. Since the lugs have a small cross section, as compared with the cross section of the turned-in edges 44 and'49, they do not short-circuit the two above-mentioned magnetic paths.

The shutter is normally held in a closed position by means of springs 52 which are mounted on the back side of the casing.

By employing two shutter vanes, to m ke the shutter double acting, and byV positioning the shutter Varies between the cylindrical lens and its focal point, the shutter may be completely and eiectively opened by moving a small distance. By decreasing the distance through which the vane must move by one-half, the speed of the shutter'is more than doubled. It will be noted that the focus of the lens 4l is at the surface oi. the i'llm 58. l

Since various modications may be made in my invention without departing from the spirit and scope thereof ,-I desire that only such limitationsv shall be placed thereon as are imposed by the prior art and are set forth in the appended claims. 1

I claim as my invention:

1. A magnetic shutter comprising a magnet coil and a movable member constituting a shutter vane, said movable member being composed of magnetic material `and cooperating with said coil to constitute an armature therefor.

2. A magnetic shutter comprising a shutter vane for closing said shutter and a magnet coil,

In the upper said vane being of magnetic material'and constituting an armature for said magnet coil.

3. A magnetic shutter comprising a movable element o! magnetic material constituting the closure member thereof, and means, including a magnet coil, for controlling said movable element, said element being in the field of said coil.

4. A shutter comprising two armatures of magnetic material, said armatures being rectangular in form and positioned, when the shutter is closed,

with ani-edge of one amature approximately in form a structure magnet coil for moving said armatures Vapart at with respect the vanes through contact with an edge of the other armature to having a cross-section or V- shape, said armatures being pivoted at the edges corresponding to the top of said V, and a magnet coil for moving said armatures apart at the apex oi said V. A 5. A shutter comprising two armatures oi magnetic material, said armatures being rectangular in form and positioned, when the shutter is closed, with an edge of one armature approximately in contact with an edge of the other armature to form a structure having a cross-section or V- shape, said armatures being pivoted near the edges corresponding to the top of said V, and a l said coil being so positioned armatures, 4that one of the poles of said magnet coil faces-in the'same direction as the apex of said V.

6. A shutter comprising two armatures of magthe apex of said V,

l neticl material, said armatures being rectangular in form and positioned, whenthe shutter is closed,

contact with an edge of the other armature to form a structure having a cross-section of V- shape, said armatures being pivoted near the edges corresponding to the top of said V, and a magsaid armatures apart at the said magnet being substantially long sides thereof partially encased in magnetic material to provide 'a magnetic path of low reluctance, each of said armatures being so positioned as to reduce the reluctance of one of said'magnetic a hs.

7. A shutter comprising two armatures of magnetic material, said armatures being rectangular in viorm and positioned, when the shutter is closed, with an mately in contact with an edge of the other armam5 ture to form a structure having a cross-section of V-shape, said armatures being pivoted near the edges corresponding to the top 'of said V, and a armatures apart at the apex of said V, said magnet being substantialin form and having cach oi the to provide a plurality of magnetic paths of low reluctance, each o! said armatures having a member corresponding to each of said paths, said members being positioned to reduce the reluctance of 

